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Making Waves: Classroom Demos and Activities for Teaching About
Seismic Waves 1
Larry Braile, Purdue [email protected],
web.ics.purdue.edu/~braile
Sheryl Braile, Happy Hollow SchoolWest Lafayette, IN
NSTA Conference, March 2006Anaheim, CALast modified March 13,
20061 This PowerPoint file:
http://web.ics.purdue.edu/~braile/new/SeismicWaves.ppt Partial
funding for this development provided by the National Science
Foundation. Copyright 2005. L. Braile. Permission granted for
reproduction for non-commercial uses.This abbreviated ppt file of
wave animations is modified from:
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Wave animationsAnimation courtesy of Dr. Dan Russell, Kettering
University http://www.kettering.edu/~drussell/demos.html Seismic
Wave animations(Developed by L. Braile)
http://web.ics.purdue.edu/~braile/edumod/waves/WaveDemo.htm
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Dan Russell animations The people waveAnimation courtesy of Dr.
Dan Russell, Kettering University
http://www.kettering.edu/~drussell/demos.html
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Dan Russell animations A wave pulseAnimation courtesy of Dr. Dan
Russell, Kettering University
http://www.kettering.edu/~drussell/demos.html
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Dan Russell animations Transverse waveAnimation courtesy of Dr.
Dan Russell, Kettering University
http://www.kettering.edu/~drussell/demos.html
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Dan Russell animations Rayleigh waveAnimation courtesy of Dr.
Dan Russell, Kettering University
http://www.kettering.edu/~drussell/demos.html
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Compressional Wave (P-Wave) Animation Deformation propagates.
Particle motion consists of alternatingcompression and dilation.
Particle motion is parallel to the direction of propagation
(longitudinal). Material returns to its original shape after wave
passes.
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Shear Wave (S-Wave) AnimationDeformation propagates. Particle
motion consists of alternating transverse motion. Particle motion
is perpendicular to the direction of propagation (transverse).
Transverse particle motion shown here is vertical but can be in any
direction. However, Earths layers tend to cause mostly vertical
(SV; in the vertical plane) or horizontal (SH) shear motions.
Material returns to its original shape after wave passes.
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Rayleigh Wave (R-Wave) AnimationDeformation propagates. Particle
motion consists of elliptical motions (generally retrograde
elliptical) in the vertical plane and parallel to the direction of
propagation. Amplitude decreases with depth. Material returns to
its original shape after wave passes.
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Love Wave (L-Wave) AnimationDeformation propagates. Particle
motion consists of alternating transverse motions. Particle motion
is horizontal and perpendicular to the direction of propagation
(transverse). To aid in seeing that the particle motion is purely
horizontal, focus on the Y axis (red line) as the wave propagates
through it. Amplitude decreases with depth. Material returns to its
original shape after wave passes.
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Schematic diagram illustrating students performing wave
simulations. Student holds a poster board or cardboard circle in
front of his or her body and walks forward (like the seismic waves
propagating in the Earth). While walking, the student moves their
circle forward and backward (push and pull, for the P wave), or up
and down (transverse motion for the shear wave), or in a retrograde
ellipse (for the Rayleigh wave), or side to side horizontally (for
the Love wave), as shown above.
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You can download the animations separately to run more
efficiently
(http://web.ics.purdue.edu/~braile/edumod/waves/WaveDemo.htm).
A complete PowerPoint presentation on the Seismic wave
animations is also available at:
http://web.ics.purdue.edu/~braile/edumod/waves/WaveDemo.ppt
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1. What seismic wave type is shown here?
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2. What seismic wave type is shown here?
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3. What seismic wave type is shown here?
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4. What seismic wave type is shown here?
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For further information, see the web
page:www.eas.purdue.edu/~braile/edumod/waves/WaveDemo.htm